Connecting to discreet devices using TCP/IP in Codesys
Hello and thank you for viewing my question. I am trying to read/write to some remote temperature controllers using TCP/IP. I am completely lost when it comes to programming Modbus.
I am using AutomationBuilder2.3 w/ Codesys
The information I have is as follows:
IP address: 172.23.7.81
Process variable address: 30360 This is to be read only
Process setpoint variabe address: 42160 This is to be R/W
Do I need additional information? What would be the easiest and most effective way to set this up please?
Thank you so much.
I am using AutomationBuilder2.3 w/ Codesys
The information I have is as follows:
IP address: 172.23.7.81
Process variable address: 30360 This is to be read only
Process setpoint variabe address: 42160 This is to be R/W
Do I need additional information? What would be the easiest and most effective way to set this up please?
Thank you so much.
Asked 4 months ago
Voted best answer
1
Hi,
Here is some simple example. Read the help for ETH_MOD_MAST.
You have to try with start address and FCT until you get the right result.
Mod_IP_Address: STRING:='172.23.7.81';
Mod_IP_Address_DW: DWORD;
ModMast_SLOT: BYTE := 0;
Mod_Unit_ID: BYTE := 0; (*Slave No. Val=0*)
Mod_FCT_4: BYTE := 4; (*for read register 40xxx*) Mod_FCT_6: BYTE := 6; (*for write register 40xxx*) Mod_FCT_3: BYTE := 3; (*for read register 30xxx*)
Mod_Address_Sensors_2: WORD :=360; (* or 361 or 359 for your address 30360 *)
Mod_NB_Sensors_2: INT := 1; (*for reading of 1 register *)
SENSORS_ARRAY: ARRAY [1..2] OF WORD;
Here is some simple example. Read the help for ETH_MOD_MAST.
You have to try with start address and FCT until you get the right result.
Mod_IP_Address: STRING:='172.23.7.81';
Mod_IP_Address_DW: DWORD;
ModMast_SLOT: BYTE := 0;
Mod_Unit_ID: BYTE := 0; (*Slave No. Val=0*)
Mod_FCT_4: BYTE := 4; (*for read register 40xxx*) Mod_FCT_6: BYTE := 6; (*for write register 40xxx*) Mod_FCT_3: BYTE := 3; (*for read register 30xxx*)
Mod_Address_Sensors_2: WORD :=360; (* or 361 or 359 for your address 30360 *)
Mod_NB_Sensors_2: INT := 1; (*for reading of 1 register *)
SENSORS_ARRAY: ARRAY [1..2] OF WORD;
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